PI=3.14
function yuanMianji(r)
	s=PI*r^2
	return s
end

function ZFX(a)
	print('Let\'s go ... ')
	for i=1,a do 
		for j=1,a do io.write('z') end
		io.write('\n')
	end
	print("zhengfanxing end")

   return("OK")
end

function yuanZhouchang(r)
	s=2*PI*r	
	return s
end

function f1()
	print("test ")
end

io.write("Input R:")
r=io.read()
S=yuanMianji(r)
L=yuanZhouchang(r)
print("s=" .. S.."  L="..L)
print(f1())
print("")
print(ZFX(r))
